Abstract：
OBJECTIVES:To evaluate root surface changes and resorption following toothborne rapid maxillary expansion (RME) using cone beam computed tomography (CBCT). SETTING AND SAMPLE POPULATION:The Department of Orthodontics at The University of Texas Health Science Center. Twenty-four consecutively treated patients (mean age: 12.8 years) requiring maxillary expansion. MATERIAL AND METHODS:An observational cohort included 48 CBCT images collected prior to (T1) and 4.8 months after (T2) RME from the study sample. Maxillary (study group) and mandibular (control group) first molars (n=48) and first premolars (n=48) were segmented and digitally registered using a 'best-fit' algorithm. Linear surface and volumetric changes between the study and control groups were compared using independent sample t-tests. Additionally, individual root length measurements were compared between the T1 and T2 images in each group using paired t-tests. RESULTS:All study teeth had significant changes for the evaluation of maximum linear surface area and volumetric changes as compared to control teeth (p<0.05). On average, premolars and molars in the study group experienced a root shortening of 0.36-0.52 mm (p<0.05). Color-coded diagrams demonstrated thinning and resorption occurring primarily at the apex and buccal aspects of the roots. Severity of these changes was individual-specific, as root resorption patterns were non-uniform. CONCLUSION:Significant volume loss, linear surface area changes, and thinning/shortening of maxillary first molar and premolar roots were common findings with the use of toothborne RME therapy.
journal_name
Orthod Craniofac Resjournal_title
Orthodontics & craniofacial researchauthors
Akyalcin S,Alexander SP,Silva RM,English JDdoi
10.1111/ocr.12069subject
Has Abstractpub_date
2015-04-01 00:00:00pages
117-26eissn
1601-6335issn
1601-6343journal_volume
18 Suppl 1pub_type
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